发明名称 |
RARE EARTH BORATE AND ITS PRECURSOR, PREPARATION PROCESSES AND USE OF BORATE AS LUMINOPHORE |
摘要 |
The present invention relates to a rare-earth borate, to a precursor thereof, to processes for their preparation and to the use of this borate as a luminophore.The rare-earth borate and the precursor thereof are characterized in that they are in the form of cubic, parallelepipedal or spherical particles and in that they have a dispersion index of not more than 0.8. According to one embodiment of the invention, the borate is a red luminophore.The process for the preparation of the precursor is characterized in that a rare-earth carbonate or hydroxycarbonate is reacted with boric acid, the reaction medium being in the form of an aqueous solution. The borate is obtained by calcination of the precursor. |
申请公布号 |
EP0874879(B1) |
申请公布日期 |
2004.11.24 |
申请号 |
EP19970900649 |
申请日期 |
1997.01.17 |
申请人 |
RHODIA CHIMIE |
发明人 |
HUGUENIN, DENIS;MACAUDIERE, PIERRE |
分类号 |
C04B35/50;C01B21/064;C01B35/00;C01B35/12;C09K11/77;C09K11/78;H01J9/227;H01J61/44 |
主分类号 |
C04B35/50 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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